No Internet since 15 December

I have been trying to get my internet working again and no one can help me whats so ever. I have had multiple technicians come and go and guess what? its still not working, I have been told by a friend that your policy is to fix it in 5 working days, the issue lies at my exchange and yet none of the technicians will go and fix it, the line is not syncing I have tried 5 different routers 5! and I have tried other ADSL accounts and its still no working. so its coming up to a month since its been working, I have informed your billing department that I will not pay until my internet is working as I will not pay for a service I am not receiving, here are my reference numbers all 3 of them<br> <br> 380ctk211215<br> ***6<br> J7p8g8p3dh<br> <br> My reference numbers will have my contact details sort this out